The International Space Station maintains an orbit with an altitude of between 330 km (205 mi) and 435 km (270 mi) by means of reboost manoeuvres using the engines of the Zvezda module or visiting spacecraft. It completes 15.50 orbits per day. The ISS crew provides opportunities for students on Earth by running student-developed experiments, making educational demonstrations, allowing for student participation in classroom versions of ISS experiments, and directly engaging students using radio, videolink and email. When the astronauts aren't working, they can be found photographing various things, such as these amazing volcanic eruptions. Click here to view the first image in this week's funny exam answers and funny school pictures gallery. Continue reading for a viral video of the real voice of Winnie the Pooh reading Darth Vader lines.